As an extra - I went to a school where the HeadMaster was a very strict Welsh Presbyterian and lived the Head's house in the school grounds with his family
Some years later I was training to be a teacher and the school invited me back - so I got talking to the new Head
Apparently when he started my old Head was just retiring and he showed the new guy around the house so he could decide whether to move in there or buy his own house off site.
The new guy asked about heating
There was a fire in the lounge and 2 radiators 'but we hardly ever use them'
Apparently if they started to feel cold in winter then OPENED ALL THE WINDOWS for a while
then closed them
That apparently makes you body adjust to the colder temperature so when the windows are closed again it feels warmer!!!
They made them tough in the Welsh Valleys in the old days!!!!